JPH0562094U - Shield case for small electronic devices - Google Patents

Abstract

(57) [Summary] [Purpose] A small electronic device that has a uniform fitting force to the case body even when part of the claw formed around the lid is cut off, and that improves electrical characteristics such as grounding characteristics. To get the shield case. [Construction] A shield case in which a printed circuit board (2) incorporating various electronic parts and elements is assembled in a case body (1) and a lid (4) is fitted to the case body (1). When the lid 4 is fitted on the case body 1, the protrusion claw 11 of the case body 1 is locked to the side surface of the claw portion 4a of the lid 4 when the lid 4 is fitted to the case body 1. It is characterized by being configured as described above.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shield case for a small electronic device, and particularly to a shield case for AV (audio / visual) signals.

[0002]

[Prior Art]

 Conventionally, this type of AV signal distribution modulator (hereinafter referred to as an RF modulator) includes a printed circuit board 2 in which various electronic parts and elements are incorporated in a case body 1 as shown in FIGS. 3 and 4. The case main body 1 has a shield structure in which an upper lid 3 and a lower lid 4 are fitted from the upper surface and the lower surface of the case body 1. A socket 5 for an antenna is attached to one side surface of the case body 1, and a socket 6 for outputting to a TV (television) and a socket 7 for inputting from a VTR (video tape recorder) are attached to the upper lid 3. Etc. are installed. When the upper lid 3 and the lower lid 4 are fitted to the case body 1 of the RF modulator, the claw portions 3a and 4a formed by bending around the upper lid 3 and the lower lid 4 and having a spring force are formed in the case body. It is elastically held by engaging projections 1a formed on the upper and lower parts of the side surface of the entire circumference of 1.

Further, on the front side surface of the case body 1, an opening window portion 1c facing the protruding portion 2a of the printed circuit board 2 is formed, and various signals are applied to the protruding portion 2a of the printed circuit board 2 protruding from this. A plurality of input / output terminals 8 for guiding are provided and are protected by an extension portion 1b formed by integrally extending both side surfaces of the case body 1.

[0004]

[Problems to be solved by the device]

 However, in the lower lid 4 fitted on the lower surface of the case body 1, a part of the claw portion 4a of the lower lid 4 corresponding to the opening window portion 1c of the case body 1 is cut off. When the lower lid 4 is fitted, the elastic force of the lower lid 4 around the case body 1 becomes different, and the lower lid 4 is twisted or the elastic force of the claw portion 4a is pulled in a strong direction. However, there is a problem that the strength of the fitting force of the lower lid 4 becomes uneven. Because of this, the engagement position between the mounting hole 4b of the lower lid 4 and the ground terminal 9 provided in the middle of the printed circuit board 2 is displaced, or between the case body 1 and the claw portion 4a of the lower lid 4. There is a problem in that the contact force becomes small, the grounding performance between the case body 1 and the lower lid 4 deteriorates, and signal errors and noise occur, which deteriorates the electrical characteristics.

An object of the present invention is to solve the above-mentioned problems of the conventional structure, and even if a part of the claw portion formed around the lower lid is cut off, the fitting force to the case body is uniform. The purpose is to obtain a shield case for small electronic devices with improved electrical characteristics.

[0006]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is a shield case in which a printed circuit board incorporating various electronic components and elements is assembled in the case body, and the case body lid is fitted to the case body. , A small protrusion that is integrally bent outward, and is configured so that when the lid is fitted on the case body, the protruding claw of the case body is locked to the side surface of the claw portion of the lid. It provides a shield case for electronic devices.

[0007]

[Action]

 According to the present invention, when the printed circuit board is assembled to the case body and the lid is fitted to the case body, the protrusion claws bent outward of the case body are attached to the side surface of the claw portion of the lid. Since the is locked, the case body and the lid are reliably positioned. Therefore, when the lid is fitted on the case body, the lid body is not twisted and the fitting force around the lid body is uniform, which improves the electrical characteristics such as the grounding performance between the case body and the lid. Can be made.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing a detached state of a lower lid according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which the lower lid of FIG. 1 is fitted. The same parts will be described with the same reference numerals.

A printed circuit board 2 is assembled in the case body 1, and an upper lid 3 and a lower lid 4 are fitted on the upper and lower surfaces of the case body 1 to form a shield structure. Further, an antenna socket 5 is attached to one side surface of the case body 1, and an output socket 6 for the TV and an input socket 7 for the VTR are attached to the upper lid 3. Engagement protrusions 1a are formed on the upper and lower portions of the side surface of the case body 1 at all proper intervals, and the protrusions 1a protrude outward slightly at appropriate intervals. Around the lower lid 4, a plurality of claw portions 3a and 4a having a spring force are bent and formed. When the upper lid 3 and the lower lid 4 are fitted to the case body 1, the claw portions 3a and 4a around the upper lid 3 and the lower lid 4 are engaged with the engaging protrusions 1a of the case body 1. It is supposed to be held.

On the other hand, on one side of the front side surface of the case main body 1, an opening window portion 1c having a downward opening is formed so as to face the projecting portion 2a of the print substrate 2 assembled from below. At the same time, although not shown, notch windows 10a and 10b, which are not shown in the figure, correspond to cutting portions for cutting individual printed circuit boards 2 from a continuously molded printed circuit board base material. Are formed.

At least one of the side wall surfaces of the cutout windows 10a and 10b formed on the side surface of the case body 1 is provided with a projection claw 11 that is integrally bent outward. ing. When the lower lid 4 is fitted from the lower side of the case main body 1, the protruding claws 11 are engaged with the side surfaces of the claw portions 4a of the lower lid 4 so that the lower lid 4 is twisted or the lower lid 4 is removed. The claw portion 4a is prevented from being pulled backward with a strong elastic force. For this purpose, it is desirable to provide a projection claw 11 on the side wall surface of the cutout window 10a or 10b formed on the side surface of the case body 1 near the opening window portion 1c.

According to the embodiment of the present invention configured as described above, when the lower lid 4 is fitted to the case body 1, the protrusion claws 11 projecting from the side wall surface of the case body 1 are attached to the lower lid 4. Since the side surface of the claw portion 4a is locked, the case body 1 and the lower lid 4 are reliably positioned, and the fitting force around the lid body becomes uniform without the lower lid 4 twisting.

[0014]

[Effect of the device]

 As described above in detail, when the printed circuit board is assembled to the case body and the lid is fitted to the shield case of the small electronic device of the present invention, the claw of the lid is attached to the protruding claw protruding from the case body. Since the side surface of the part is locked, the case body and the lid are accurately positioned. Therefore, when the lid is fitted on the case body, the lid body is not twisted and the fitting force around the lid body is uniform, and the electrical characteristics such as the grounding performance between the case body and the lid are improved. You can

[Brief description of drawings]

FIG. 1 is a perspective view showing a removed state of a lower lid according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the lower lid of FIG. 1 is fitted.

FIG. 3 is a perspective view showing a conventional AV signal distribution modulator.

FIG. 4 is a bottom perspective view showing a state where the lower lid of FIG. 3 is removed.

[Explanation of symbols]

 1 Case Main Body 2 Printed Circuit Board 3 Upper Lid 4 Lower Lid 4a Claws 10a, 10b Notch Window 11 Protruding Claw

Claims (1)

[Scope of utility model registration request] 1. A shield case in which a printed circuit board incorporating various electronic components, elements, etc. is assembled in a case body, and a lid is fitted to the case body, the shield case comprising:
A protruding claw that is integrally bent outward is provided, and when the lid is fitted to the case body, the protruding claw of the case body is configured to be locked to the side surface of the claw portion of the lid. A characteristic shield case for small electronic devices.